batgrbproduct Analysis for Trigger=710050
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Aug 28 20:09:16 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger710050/GCN5_download_cron
======================================================================
Trigger: 00710050 Segment: 000
BAT Trigger Time: 494005622.016 [s; MET]
Trigger Stop: 494005630.208 [s; MET]
UTC: 2016-08-27T15:46:45.243300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 179.296328377896 Dec: -29.1593372498433 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.32
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 8.32
Flight Position: [ source = BAT ]
RA: 179.296328377896 Dec: -29.1593372498433 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 179.276682905238 Dec: -29.1778486471636 [deg; J2000]
{ 11h 57m 06.4s , -29d 10' 40.3" }
+/- 2.5261876803742 [arcmin] (estimated 90% radius based on SNR)
+/- 1.57161387066293 [arcmin] (formal 1-sigma fit error)
SNR: 8.09408022246637
Angular difference between Flight and Ground position is 1.514259 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 14.0480000376701 +/- 5.55537073797478
Measured from: -4.07199984788895
to: 9.97600018978119 [s; relative to TRIGTIME]
T50: 6.36800003051758 +/- 2.91354904186033
Measured from: -0.391999840736389
to: 5.97600018978119 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.41200000047684
to: 3.41200000047684 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.95199996232986
to: 10.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.274278 0.342228 0.089733 -0.001477
0.040699 0.041991 0.035446 0.030836 [error]
Peak 0.043732 0.043375 0.000471 0.007312
0.009358 0.009834 0.008302 0.007270 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 9.72e-08 1.22e-07 1.11e-07 1.76e-07 3.90e-07 5.06e-07 erg/cm2
Error 1.96e-08 2.00e-08 3.18e-08 9.59e-08 7.55e-08 1.37e-07 erg/cm2
Peak flux Power-law 4.07e-01 2.59e-01 1.07e-01 5.98e-02 8.03e-01 8.33e-01 ph/cm2/s
Error 1.46e-01 8.17e-02 6.02e-02 7.13e-02 2.36e-01 2.50e-01 ph/cm2/s
Fluence Cutoff-PL 8.42e-08 1.58e-07 8.06e-08 6.27e-09 3.29e-07 3.29e-07 erg/cm2
Error 2.31e-08 3.16e-08 4.26e-08 2.57e-08 6.84e-08 7.22e-08 erg/cm2
Peak flux Cutoff-PL 3.63e-01 3.61e-01 4.32e-02 1.79e-04 7.67e-01 7.67e-01 ph/cm2/s
Error 1.71e-01 1.30e-01 6.94e-02 1.92e-02 2.25e-01 2.25e-01 ph/cm2/s
Fluence Band 8.41e-08 1.56e-07 8.28e-08 1.83e-08 3.35e-07 3.42e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.133 0.287 - - 2.11e-03 4.51e-04 60.210 57
CPL -0.399 2.164 35.5 7.9 7.48e-02 1.54e+00 53.210 56
The chi2 of BB fit is 53.84 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.279 0.582 - - 4.65e-03 2.03e-03 61.310 57
CPL -1.274 5.705 30.0 0.0 1.07e+00 0.00e+00 58.700 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.840 -8.952 10.888
T90 14.048 -4.072 9.976
T50 6.368 -0.392 5.976
Peak 1.000 2.412 3.412
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
179.2767 -29.1778 0.0237 32.9 -52.7 0.6940 8.1 TRIG_00710050
------------------------------------------
Foreground time interval of the image:
-8.952 10.888 (delta_t = 19.840 [sec])
Background time interval of the image:
-239.016 -8.952 (delta_t = 230.064 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -8.952 sec. to 10.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13295 ( -0.273341 0.301326 )
Norm@50keV : 2.11007E-03 ( -0.000455589 0.000445581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.605663e-01
Photon flux (15-150 keV) in 19.84 sec: 0.337471 ( -0.0532319 0.053232 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90289e-07 ( -7.40742e-08 7.68443e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.952 sec. to 10.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.399062 ( -2.55915 1.76862 )
Epeak [keV] : 35.5324 ( -7.96477 7.78679 )
Norm@50keV : 7.47540E-02 ( -0.0803697 2.99793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.21 using 59 PHA bins.
# Reduced chi-squared = 0.9502 for 56 degrees of freedom
# Null hypothesis probability = 5.810322e-01
Photon flux (15-150 keV) in 19.84 sec: 0.320009 ( -0.053086 0.053527 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2906e-07 ( -6.23512e-08 7.44635e-08 ) ergs/cm2
Band function
Time interval is from -8.952 sec. to 10.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.365137 ( -1.73018 3.99345 )
beta : -9.37167 ( 9.37167 19.3708 )
Epeak [keV] : 35.5941 ( -6.04009 6.79781 )
Norm@50keV : 7.09763E-02 ( -0.0761561 3.6749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.22 using 59 PHA bins.
# Reduced chi-squared = 0.9676 for 55 degrees of freedom
# Null hypothesis probability = 5.430625e-01
Photon flux (15-150 keV) in 19.84 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35143e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.13911 (-1.26615 1.45778)
R^2/D10^2 : 0.236882 (-0.105066 0.186669)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9445 for 57 degrees of freedom
# Null hypothesis probability = 5.945307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.702e-08 2.104e-08
25- 50 1.676e-07 4.114e-08
50-150 6.701e-08 2.925e-08
15-150 3.117e-07 6.646e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.9364 (-15.4428 27.858)
Norm : 1.98007 (-0.454638 0.617108)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9798 for 57 degrees of freedom
# Null hypothesis probability = 5.183951e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.557e-08 1.976e-08
25- 50 1.362e-07 3.066e-08
50-150 1.296e-07 6.487e-08
15-150 3.613e-07 8.819e-08
Double BB
# Reduced chi-squared = 0.9519 for 55 degrees of freedom
# Reduced chi-squared = 0.9509 for 55 degrees of freedom
# Reduced chi-squared = 0.9504 for 55 degrees of freedom
# Reduced chi-squared = 0.9501 for 55 degrees of freedom
# Reduced chi-squared = 0.9499 for 55 degrees of freedom
# Null hypothesis probability = 5.629174e-01
# Null hypothesis probability = 5.685269e-01
# Null hypothesis probability = 5.729522e-01
# Null hypothesis probability = 5.763044e-01
# Null hypothesis probability = 5.783821e-01
# Null hypothesis probability = 5.795270e-01
# Null hypothesis probability = 5.801098e-01
# Null hypothesis probability = 5.804998e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.242e-08 3.543e-08
25- 50 1.619e-07 7.344e-08
50-150 7.457e-08 4.084e-08
15-150 3.189e-07 1.382e-07
Peak spectrum fit
Power-law model
Time interval is from 2.412 sec. to 3.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27939 ( -0.519952 0.643098 )
Norm@50keV : 4.64812E-03 ( -0.00204824 0.00202122 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.31 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.240255e-01
Photon flux (15-150 keV) in 1 sec: 0.803099 ( -0.236344 0.236555 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.42605e-08 ( -1.58141e-08 1.72012e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.412 sec. to 3.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27398 ( -7.97736 3.43238 )
Epeak [keV] : 30.0373 ( )
Norm@50keV : 1.06747 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.70 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.768844e-01
Photon flux (15-150 keV) in 1 sec: 0.767111 ( -0.222426 0.227383 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51725e-08 ( -1.08992e-08 1.5469e-08 ) ergs/cm2
Band function
Time interval is from 2.412 sec. to 3.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.41570 ( -4.40446 -4.40446 )
beta : -4.97445 ( 3.82037 1.50817 )
Epeak [keV] : 30.6902 ( -6.28496 12.4135 )
Norm@50keV : 5.84120 ( -5.88209 214.097 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.468604e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7182e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.73367 (-1.74586 2.20917)
R^2/D10^2 : 1.10835 (-1.10835 1.96761)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.64 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.150883e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.168e-08 7.065e-09
25- 50 1.925e-08 1.201e-08
50-150 4.517e-09 3.482e-09
15-150 3.544e-08 2.157e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.8838 (-17.5104 50.3336)
Norm : 5.63188 (-2.3905 4.41582)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.05 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.658950e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.256e-08 6.894e-09
25- 50 1.594e-08 8.775e-09
50-150 1.126e-08 8.732e-09
15-150 3.976e-08 2.353e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 2.52660E-05 (-2.52659e-05 -2.52659e-05)
kT2 [keV] : 7.54844 (-1.66212 2.22979)
R2^2/D10^2 : 1.19843 (-0.782685 1.67859)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.31 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Reduced chi-squared = 1.060 for 55 degrees of freedom
# Null hypothesis probability = 3.434945e-01
# Null hypothesis probability = 3.546973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.168e-08 7.230e-01
25- 50 1.925e-08 6.400e+00
50-150 4.517e-09 1.566e+02
15-150 3.544e-08 1.542e+02
Plot creation:
Sun Aug 28 20:13:57 EDT 2016